Apogee Symphony here.
No more Midi problems during 10.05 firmware update (or I just got lucky). I updated to the latest Motu 828mk3 drivers and also updated Axe-Edit and swapped the places of my midi cables (while using the loop back test feature of new Axe-Edit). So I can't be sure which of the three changes, or the new firmware version, did the trick.Motu 828mk3. Soundwise ok but with a couple of latest driver versions I haven't been able to update Axe's firmware. I need to install older drivers in order to update. If I ever have the money, I'll upgrade to RME.
I used an Impact Twin for about a month while my Fireface 400 was in for repair. I didn't have any problems with it. I was using it with a Mac.
The two M-Audio ones - Profire610 and 2626 work without problems. Nothing exceptional but solid enough.
If you have a bigger budget, of course, then there will be other choices.
A have a few: M-Audio Profire 610, Echo Audio Gina 3G, Tascam US-122 (the original one), The inputs on my Yamaha Motif XS (firewire to computer).
Depends which computer I'm using but I like the Profire the best (Clean, simple, inexpensive).
Always go with a TI chipset Firewire interface to avoid problems. Others MAY work but TI will ALWAYS work.
Rodney